19/09/18
Page 49 of 67
ASR650 Operational Manual
4.8.2
RF Power
The ASR650 offers the possibility to select the transmitter power in six stages. The factory default
value is ‘
4 (9.0V)
’. The highest possible output power is ‘
6 (12.0V)
’. The higher the output power,
the stronger the RF field and hence the reading range (if electromagnetic noise is not a problem).
Please keep in mind that there are minimum antenna impedance requirements depending on the
selected RF Power (see chapter 2.1.6).
Select the desired RF Power stage and
confirm with ‘
set
’ or request the current
reader setting via ‘
get
’.
The receiver sensitivity setting might be
used in addition in order to fine-tune the
reading range.
4.8.3
Receiver sensitivity
In addition to the RF Power setting the reading range can also be influenced by configuring the
‘
Receiver sensitivity
’. This is possible for both receivers separately – FDX and HDX. The default
value of ‘100%’ means that the receivers are operating at full sensitivity.
Select the desired sensitivity and confirm
with ‘
set
’ or request the currently configured
value via ‘
get
’. This has to be done for FDX
and HDX in case both technologies should
be used.
The button ‘
auto adj.
’ helps to find the correct setting when the required reading range is known.
Place the tag in front of the antenna at the desired distance in optimum orientation (see chapter
2.1.5 for details). Then press this button in order to set the minimum signal strength for this desired
distance. The reader will use the new setting right away.
Please keep in mind that the reading range strongly depends on the
transponder orientation. This should be carefully considered when reducing
the receiver sensitivity. Tags in an unfavorable orientation might not be read
any longer when this sensitivity is too low.
When the application requires a reduced reading range it is recommended
rather to reduce the RF-Power than the sensitivity first. It makes no sense to
operate the reader at full power while the receiver sensitivity is low.